I suspect you won't want to here this, but If you are having similar problems with two specimens of the same grill, it is unlikely that both are defective. It is far more likely that you have done something wrong in the setup process.
You should have joined this forum a year ago, shortly after you purchased your grill and began to have issues. Perhaps, one of the users here would have been able to help you get these problems sorted.
This forum, while named "Traeger" has nothing whatsoever to do with the Traeger Corporation that designed, manufactured, marketed, and distributed your grill. We are a group of users who are using Traeger appliances to produce some tasty foodstuffs. Most of us have had issues from time to time and help each other work through those issues.
An email to the president of Traeger is not likely to have any effect. You are much more likely to have an impact if you send a letter. The address is:
Office of the President
TRAEGER, INC
533 South 400 West
Salt Lake City, UT 84101
Setting up the WiFi connection on your Traeger grill is not difficult, but there are some technical issues that have stumped many users. There are several threads about these problems; the vast majority were resolved successfully with the help of other users.
1. Your cell phone must be connected to a 2.4 gHz WiFi channel on your router. Generally, phones will automatically connect to a faster 5 gHz channel. You must force your phone to use 2.4 gHz by disabling 5 gHz and 6 gHz if available. Only then will the connection work.
2. You must then turn on the Traeger and connect it to your cell phone using Bluetooth mode. If you do not see the pairing of your phone to BT, turn off BT on your phone and turn it back on; it should connect.
3. In the Traeger app provide the proper 2.4 gHz WiFi SSID and password for your router to allow it to connect. Please note that the Traeger must be located within range of your router. I have a brick fireplace in direct line of sight between the grill and my router, so the connection can be spotty.
Try this procedure and see if you can get your grill to connect. It might save you the cost of a stamp.
If you need additional assistance, members of the forum will be glad to help.